/*
 * YAJHFC - Yet another Java Hylafax client
 * Copyright (C) 2005-2011 Jonas Wolz <info@yajhfc.de>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Linking YajHFC statically or dynamically with other modules is making 
 *  a combined work based on YajHFC. Thus, the terms and conditions of 
 *  the GNU General Public License cover the whole combination.
 *  In addition, as a special exception, the copyright holders of YajHFC 
 *  give you permission to combine YajHFC with modules that are loaded using
 *  the YajHFC plugin interface as long as such plugins do not attempt to
 *  change the application's name (for example they may not change the main window title bar 
 *  and may not replace or change the About dialog).
 *  You may copy and distribute such a system following the terms of the
 *  GNU GPL for YajHFC and the licenses of the other code concerned,
 *  provided that you include the source code of that other code when 
 *  and as the GNU GPL requires distribution of source code.
 *  
 *  Note that people who make modified versions of YajHFC are not obligated to grant 
 *  this special exception for their modified versions; it is their choice whether to do so.
 *  The GNU General Public License gives permission to release a modified 
 *  version without this exception; this exception also makes it possible 
 *  to release a modified version which carries forward this exception.
 */
package yajhfc.phonebook.convrules;

import java.util.logging.Level;
import java.util.logging.Logger;

import yajhfc.phonebook.convrules.RuleParser.RuleParseException;

/**
 * @author jonas
 *
 */
public class RuleSerializer {
    private static final Logger log = Logger.getLogger(RuleSerializer.class.getName());
    
    /**
     * Deserializes a rule previously serialized by ruleToString
     * @param s
     * @param enumType
     * @param defaultValue
     * @return
     */
    public static <T extends Enum<T>> EntryToStringRule stringToRule(String s, Class<T> enumType, EntryToStringRule defaultValue) {
        if (s == null || s.length()==0)
            return defaultValue;
        
        EntryToStringRule rule;
        switch (s.charAt(0)) {
        case '$': // Predefined
            rule = (EntryToStringRule)Enum.valueOf(enumType, s.substring(1));
            break;
        case '%':
            try {
                rule = RuleParser.parseRule(s.substring(1), false);
            } catch (RuleParseException e) {
                log.log(Level.WARNING, "Could not parse rule", e);
                rule = null;
            }
            break;
        default:
            rule = (EntryToStringRule)Enum.valueOf(enumType, s);
            break;
        }
        
        if  (rule == null) {
            log.warning("Unknown rule, returning default: " + s);
            return defaultValue;
        } else {
            return rule;
        }
    }
    
    /**
     * Serializes a rule to a String
     * @param s
     * @param enumType
     * @return
     */
    public static <T extends Enum<T>> String ruleToString(EntryToStringRule rule, Class<T> enumType) {
        if (enumType.isAssignableFrom(rule.getClass())) {
            return "$" + ((Enum<?>)rule).name();
        } else {
            return "%" + RuleParser.ruleToString(rule, false);
        }
    }
}
